Author Follow up period range in years (average) No of teeth Overall Percentage of teeth lost/failed
Bergenholtz, 197224 2-11 45 6
Klavan, 197523 1-7 (3) 34 2.9
Hamp and Nyman14 5 87 0
Langer et al., 198122 10 100 38
Erpenstein, 198325 1-7 (2.9) 34 8.8
Buhler, 1988, 20 10 28 32
Newel 199132 0.5-7 70 30
Basten 199642 2-23 (11.5) 49 8
Blomlof et al 1997 43 3-10 (5.8) 146 22
Carnevale 199833 10 175 7
Hou 199926 5-13 (6.7±1.9) 85 0
Park et al 2009 35 10 342 29.8
Lee et al 201227 10 149 59.7
Derks 201831 4–30 (14.7 ± 6.8 ). 90 33.3
Alassadi 202044 1-16.8 (5 ± 4.3) 85 44.7%
AlSayed 2020 45 1-15 (9.62 ± 3.08) 130 43.1%